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1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeMay 30th 2014
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   Author: Urs
   Format: MarkdownItexSince Hisham's article came out * [[Hisham Sati]], _Ninebrane structures_ ([arXiv:1405.7686](http://arxiv.org/abs/1405.7686)) I briefly created a stub entry _[[ninebrane structure]]_ and expanded the _[[higher spin structure - table]]_ accordingly. More should be done here, but I don't have the leisure right now.

   Since Hisham’s article came out

   • Hisham Sati, Ninebrane structures (arXiv:1405.7686)

   I briefly created a stub entry ninebrane structure and expanded the higher spin structure - table accordingly. More should be done here, but I don’t have the leisure right now.

2. • CommentRowNumber2.
   • CommentAuthorDavidRoberts
   • CommentTimeMay 30th 2014
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   Author: DavidRoberts
   Format: MarkdownItexYou may not have the time now, but for later: if the tangent bundle of an 11-manifold has a classifying map that lifts to the 13-connected cover of BO(11), then isn't the tangent bundle trivialisable?

   You may not have the time now, but for later: if the tangent bundle of an 11-manifold has a classifying map that lifts to the 13-connected cover of BO(11), then isn’t the tangent bundle trivialisable?

3. • CommentRowNumber3.
   • CommentAuthorUrs
   • CommentTimeMay 30th 2014
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   Author: Urs
   Format: MarkdownItexYes, but the space of choices of ninebrane structures may still be non-trivial and, maybe more importantly, after differential refinement the secondary invariants are non-trivial, they are the 11d Chern-Simons invariants.

   Yes, but the space of choices of ninebrane structures may still be non-trivial and, maybe more importantly, after differential refinement the secondary invariants are non-trivial, they are the 11d Chern-Simons invariants.